This article is a stub. You can help the microformats.org wiki by expanding it.
Previous efforts at link-preview formats:
Proprietary efforts at link-preview formats (proposed, maintained, and supported by only one vendor)
See http://indiewebcamp.com/Twitter_Cards (and expand inline here)
There have been a couple of standards created explicitly for information for link previews.
- oEmbed - since 2009. However it requires an extra endpoint (URL, different language(s) etc.)
Open Graph Protocol
Though proposed and maintained exclusively by Facebook, their Open Graph Protocol is licensed with a OWFa license which is quite open (allows derivative works etc.)
See http://indiewebcamp.com/The_Open_Graph_Protocol (and expand inline here)